鲸鱼起源于大约六千万年前亚洲的淡水湖泊和河流。
Whales originated in the freshwater lakes and rivers of ancient Asia about sixty million years ago.
起源于干旱地区的流动性河流和溪流通常被称为“内源河流”。
Regularly flowing rivers and streams that originate within arid lands are known as "endogenous".
在漂流过程中，使用一种起源于东南部湍急河流的轻量级策略，为我节省了时间，使我可以划得更远，玩得更开心，而无需过多考虑安全问题。
In kayaking, a lightweight strategy born on southeastern steep creeks saved me time so I could paddle longer rivers and have more fun without compromising safety.
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